A majority of Americans oppose the construction of a border wall. President Trump’s insistence on building it has led to a bitter political impasse and a government shutdown. We spoke with a sheriff on the border who supports the president’s efforts.

On today’s episode:

Mark Napier, the sheriff of Pima County, Ariz.

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During his visit to Texas near the border with Mexico, President Trump said that before any discussion about broader changes to U.S. immigration policies can take place, including the fate of so-called Dreamers, he wanted to tackle construction of a barrier.CreditCreditDoug Mills/The New York Times